chore(ci): consolidate linters (#139)

## Why this should be merged

Branch-protection rules only require the Go linter (erroneously called
`lint`) by mistake. All linters are now dependencies of a single `lint`
job that remains as a PR gate. New linters will now be enforced by
default.

Closes #138 

## How this works

GitHub Actions `need` configuration. The path limitation of running
`yamllint` is removed because it's such a cheap job so is ok to always
run.

## How this was tested

Inspection of CI run and PR's required jobs:


![image](https://github.com/user-attachments/assets/9454ca35-8a7f-4393-bdd8-5029cfaaf7e6)


![image](https://github.com/user-attachments/assets/e92b964d-5a64-415d-b8a3-1e9c84af3060)

.github/workflows/go.yml

@@ -85,4 +85,4 @@ jobs:
     needs: go_tidy_matrix
     runs-on: ubuntu-latest
     steps:
-      - run: echo "I'm a no-op"
+      - run: echo "Dependencies successful"

.github/workflows/lint.yml

@@ -1,4 +1,7 @@
-name: golangci-lint
+name: lint
+
+# If adding a new linter: (a) create a new job; and (b) add it to the `needs`
+# list of the `lint` job as this is what gates PRs.
 
 on:
   push:
@@ -18,8 +21,13 @@ concurrency:
   cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
 
 jobs:
-  golangci:
-    name: lint
+  lint:
+    runs-on: ubuntu-latest
+    needs: [golangci-lint, yamllint, shellcheck]
+    steps:
+      - run: echo "Dependencies successful"
+
+  golangci-lint:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -40,3 +48,18 @@ jobs:
         uses: golangci/golangci-lint-action@v6
         with:
           version: v1.60
+
+  yamllint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: yamllint -c .yamllint.yml .
+
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run ShellCheck
+        uses: ludeeus/action-shellcheck@2.0.0
+        with:
+          scandir: './libevm'

.github/workflows/shellcheck.yml

@@ -1,22 +0,0 @@
-name: shellcheck
-
-on:
-  push:
-    branches: [main, "release/**"]
-  pull_request:
-    branches: [main, "release/**"]
-  workflow_dispatch:
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
-
-jobs:
-  shellcheck:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Run ShellCheck
-        uses: ludeeus/action-shellcheck@2.0.0
-        with:
-          scandir: './libevm'

.github/workflows/yml.yml

@@ -1,22 +0,0 @@
-name: YAML check
-
-on:
-  pull_request:
-    branches: [main]
-    paths:
-      - "**/*.yml"
-      - "**/*.yaml"
-      - ".github/workflows/yml.yml"
-      - ".github/yamllint.yml"
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
-
-jobs:
-  yaml-check:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Validate YAML files
-        run: yamllint -c .yamllint.yml .